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Updated: June 28, 2025
Why, sir, you told us you were going to turn over the pole a bit and freeze up Europe. I was up here loading the condenser when you cut me off from the alternator. I opened the switch and put on the electrometer to see if we had enough. Next everything was clouded, and I went over to the window to see what was going on." "Yes," commented Bennie approvingly, "all right so far. What happened then?"
"Wrong," said Jack, glancing at the barograph on the dashboard in front of him. "We have reached two thousand eight hundred feet." "I must be asleep," said Tom, frowning. "Shall I connect the alternator?" Jack nodded and prepared to send greetings to his father, hundreds of miles away. They were out in the country now.
In connection with thoughts of a similar nature, it appeared to me of great interest to demonstrate the rigidity of a vibrating gaseous column. Although with such low frequencies as, say 10,000 per second, which I was able to obtain without difficulty from a specially constructed alternator, the task looked discouraging at first, I made a series of experiments.
There was a flash of searing flame and the reeking smoke of burning flesh those three arms had taken the terrific no-load voltage of the three-phase converter system, and the full power of the alternator had been shorted directly to ground through the comparatively small resistance of his body.
As a matter of fact, these trucks are so designed that, if it is necessary, they can carry a crew of ten men, while by means of a special clutch and gear the engine is made to drive an alternator for generating the necessary electrical energy which, under the most adverse atmospheric conditions, will give a sending and receiving range of at least one hundred miles.
When a condenser is put on a dynamo, the condenser current leads relatively to the electromotive force, and therefore strengthens the field magnets and increases the pressure. In order to test this, the following experiment was made for the author by Mr. W.F. Bourne. A Gramme alternator was coupled to the low pressure coil of a transformer, and a hot wire voltmeter put across the primary circuit.
G is an ordinarily constructed alternator, supplying the primary P of an induction coil, the secondary S of which charges the condensers or jars CC. The terminals of the secondary are connected to the inside coatings of the jars, the outer coatings being connected to the ends of the primary pp of a second induction coil. This primary pp has a small air gap ab.
To demonstrate a novel and interesting feature, I have, for a reason which I will explain, selected this type of motor. When the ends of the coil are connected to the terminals of an alternator the disc is set in rotation. But it is not this experiment, now well known, which I desire to perform.
They flew over meadow land and pasture, farmhouses where tiny figures emerged from buildings and looked up at them, over rivers and railroads, and still the alternator spat and sparked and the messages between Jack and his father were interchanged in a steady stream. Rayburn had been left behind. They were now over a small town Jack believed to be Hempstead. He looked at his map to make sure.
We've got to use pretty near the full lift to get the alternator up to the proper speed." A chill ran down Bennie's spine. They were going to start the engine!
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